Gamma correction system and method

Abstract

The present disclosure provides a gamma correction system and method. In the present disclosure, a gamma correction method used for a display panel of a liquid crystal display includes: measuring actual brightness values of preset highest grayscale and lowest grayscale of a central region of the display panel; calculating target brightness values of respective preset tie-point grayscales of the central area based on the actual brightness values, wherein the respective preset tie-point grayscale are located between the preset highest grayscale and the lowest grayscale; adjusting the respective preset tie-point grayscale of the central region and regions of both sides respectively according to the target brightness values, and computing compensating grayscale values of the adjusted respective preset tie-point grayscale; storing the compensating grayscale values, and correcting the gamma curves of the central region and the regions of both sides by using the stored compensating grayscale values.

The invention claimed is: 
     
       1. A gamma correction method used for a display panel of a liquid crystal display, comprising:
 measuring actual brightness values of preset highest grayscale and lowest grayscale of a central region of the display panel; 
 computing target brightness values of respective preset tie-point grayscale of the central region based on the actual brightness values of the preset highest grayscale and lowest grayscale of the central region, wherein the respective preset tie-point grayscale are located between the preset highest grayscale and the lowest grayscale; 
 adjusting the respective preset tie-point grayscale of the central region and regions of both sides respectively according to the target brightness values of the respective preset tie-point grayscale of the central region, and computing compensating grayscale values of the adjusted respective preset tie-point grayscale of the central region and the regions of both sides; 
 storing the compensating grayscale values of the central region and the regions of both sides, and correcting the gamma curves of the central region and the regions of both sides by using the stored compensating grayscale values of the central region and the regions of both sides; 
 wherein adjusting the respective preset tie-point grayscale of the central region and regions of both sides according to the target brightness values of the central region and computing the adjusted compensating grayscale values of the central region and the regions of both sides comprises: 
 allowing the display panel to display images of the respective preset tie-point grayscale, and measuring the actual brightness values of the respective preset tie-point grayscale of the central region of the display panel; 
 adjusting the respective preset tie-point grayscale of the central region according to the target brightness values of the respective preset tie-point grayscale of the central region, so that the actual brightness values of the respective preset tie-point grayscale are respectively equal to the target brightness values of the respective preset tie-point grayscale; 
 computing the compensating grayscale values of the adjusted respective preset tie-point grayscale of the central region. 
 
     
     
       2. The gamma correction method of  claim 1 , wherein measuring the actual brightness values of the preset highest grayscale and lowest grayscale of the central region of the display panel further comprises:
 allowing the display panel to display images of the preset highest grayscale and lowest grayscale; 
 measuring and recording respectively the actual brightness values of the preset highest grayscale and lowest grayscale of the central region of the display panel. 
 
     
     
       3. The gamma correction method of  claim 1 , wherein adjusting the respective preset tie-point grayscale of the central region and regions of both sides according to the target brightness values of the central region and computing the adjusted compensating grayscale values of the central region and the regions of both sides further comprises:
 measuring the actual brightness values of the respective preset tie-point grayscale of the regions of both sides of the display panel; 
 adjusting the corresponding respective preset tie-point grayscale of the regions of both sides according to the brightness values of the adjusted respective preset tie-point grayscale of the central region, so that the actual brightness values of the respective preset tie-point grayscale of the regions of both sides are respectively equal to the target brightness values of the respective preset tie-point grayscale of the central region; 
 computing the compensating grayscale values of the adjusted respective preset tie-point grayscale of the regions of both sides. 
 
     
     
       4. The gamma correction method of  claim 1 , wherein the respective preset tie-point grayscale of the central region and the regions of both sides are adjusted by adjusting the gamma voltage.